Things used in this project

Hardware components:
Microbitheart
micro:bit BBC micro:bit board
×1
Software apps and online services:
Blynk logo avatars
Blynk

Code

Code snippetArduino
#define LED_ROW2 27
#define LED_COL3 10

BLYNK_WRITE(V0)
{
  pinMode(LED_ROW2, OUTPUT);
  pinMode(LED_COL3, OUTPUT);
  if (param.asInt() == 1)        /* When button widget is "ON" */
  {
    digitalWrite(LED_ROW2, 1);
    digitalWrite(LED_COL3, 0);
  }
  else
  {
    digitalWrite(LED_ROW2, 0);
    digitalWrite(LED_COL3, 0);
  }
}

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